Abstract
Electroless plating of Pd-P alloys from palladium-ethylenediamine complex solutions containing sodium hypophosphite as a reducing agent, was investigated. The deposition rate of Pd-P alloys was markedly influenced by the concentration of palladium chloride and bath temperature. The phosphorus content of deposits was proportional to the 0.2 power of sodium hypophosphite concentration. In Pd-P alloys, the amorphous solid was converted with heat treatment at 250-300°C into either stable crystal phase Pd plus Pd8P or Pd plus Pd6P, according to phosphorus content. It was found that hardness increased when heat treatment of the alloy resulted in the formation of PdxP crystals.
